PorscheZen

This happens especially when the radio is on, but sometimes when it's off!
I changed all 4 speakers last year.

Any Idears?

Greg_L

does the wining change pitch with engine revs? This can be cured with a £3 line level convertor iirc.

PorscheZen

- YES
- Let me know/send me a link if you can.
Thanks!

Southampton76

You have a bad earth somewhere. Is it one speaker or all of them?

PorscheZen

Not sure which speaker it's coming from or if it's coming from all. I'll have to check...

deep_uv

Mine did that when some plugs were left disconnected after a valve adjustment (not by me on that one ) and again when the alternator went bad.

Meares

go to any car stereo installer and tell him your prob., he'll fix it

CarreraCup03

You may have a ground problem. You can also get a ground loop isolator .. that may work.

dutchcrunch

whinning is generated from the altenator, you have 1990, need filter mod in the back. i had ignition noise, whit stock amp. i grounded the amp at the seat instead of the factory groung going thru the harness. solved my problem.

LA964RS

Perfect fix: Remove stereo/amp and all ancillary wiring, install $5 factory radio delete plate....use ipod.....

Uber 911

dutchcrunch, I have the same problem on a 1990 C2.
Is the winning noise ONLY an earth/ground problem?

dutchcrunch

for me it was. someone posted a porsche document and this is one of the fixes. as soon as i grounded the stock amp at the ground stud under the seat, its right next to the amp, the noise went away. do you have the stock stereo with the amp set up??????

Sal 965

Anyone have a picture of this grounding point under the seat or know if the seat needs to come out to access it?

dutchcrunch

slide passenger seat all the way back, remove floor mat and pull factory carpet back, it is not glued but has a snap to hold it down. the ground lug is right at the rocker panel. when you remove nut, you might need to remove the existing ground strap and tighten another under and the stud is not welded to the frame, just a factory bolt. make sense. it can come loose when you loosed the initial hold down nut. do not get to crazy when you tighten it do not want to snap off stud.

dutchcrunch

there is one nut to hold the ground stud on the car an another to secure wires to stud. i meant to say that you might have to tighten the nut that holds the ground stud to rhe frame. you will see when you look at it.